Source/WebCore/platform/ScrollAnimatorSmooth.cpp

/*
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 * Copyright (C) 2015 Apple Inc.  All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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#include "config.h"
#include "ScrollAnimatorSmooth.h"

#if ENABLE(SMOOTH_SCROLLING)

#include "ScrollAnimationSmooth.h"
#include "ScrollableArea.h"

namespace WebCore {

std::unique_ptr<ScrollAnimator> ScrollAnimator::create(ScrollableArea& scrollableArea)
{
    if (scrollableArea.scrollAnimatorEnabled())
        return std::make_unique<ScrollAnimatorSmooth>(scrollableArea);
    return std::make_unique<ScrollAnimator>(scrollableArea);
}

ScrollAnimatorSmooth::ScrollAnimatorSmooth(ScrollableArea& scrollableArea)
    : ScrollAnimator(scrollableArea)
    , m_animation(std::make_unique<ScrollAnimationSmooth>(scrollableArea, m_currentPosition, [this](FloatPoint&& position) {
        FloatSize delta = position - m_currentPosition;
        m_currentPosition = WTFMove(position);
        notifyPositionChanged(delta);
    }))
{
}

ScrollAnimatorSmooth::~ScrollAnimatorSmooth() = default;

bool ScrollAnimatorSmooth::scroll(ScrollbarOrientation orientation, ScrollGranularity granularity, float step, float multiplier)
{
    if (!m_scrollableArea.scrollAnimatorEnabled() || granularity == ScrollByPrecisePixel)
        return ScrollAnimator::scroll(orientation, granularity, step, multiplier);

    return m_animation->scroll(orientation, granularity, step, multiplier);
}

void ScrollAnimatorSmooth::scrollToOffsetWithoutAnimation(const FloatPoint& offset)
{
    FloatPoint position = ScrollableArea::scrollPositionFromOffset(offset, toFloatSize(m_scrollableArea.scrollOrigin()));
    m_animation->setCurrentPosition(position);

    FloatSize delta = position - m_currentPosition;
    m_currentPosition = position;
    notifyPositionChanged(delta);
}

#if !USE(REQUEST_ANIMATION_FRAME_TIMER)
void ScrollAnimatorSmooth::cancelAnimations()
{
    m_animation->stop();
}

void ScrollAnimatorSmooth::serviceScrollAnimations()
{
    m_animation->serviceAnimation();
}
#endif

void ScrollAnimatorSmooth::willEndLiveResize()
{
    m_animation->updateVisibleLengths();
}

void ScrollAnimatorSmooth::didAddVerticalScrollbar(Scrollbar*)
{
    m_animation->updateVisibleLengths();
}

void ScrollAnimatorSmooth::didAddHorizontalScrollbar(Scrollbar*)
{
    m_animation->updateVisibleLengths();
}

} // namespace WebCore

#endif // ENABLE(SMOOTH_SCROLLING)